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Fueling system vapor recovery and containment performance monitor and method of operation thereof

  • US 6,968,868 B2
  • Filed: 12/11/2003
  • Issued: 11/29/2005
  • Est. Priority Date: 11/30/1999
  • Status: Expired due to Term
First Claim
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1. A method of monitoring a vapor recovery system that recovers vapors expelled from a vehicle during refueling and returns the vapors back to an underground storage tank in a service station environment, comprising:

  • a measuring an amount of fuel flow delivered to the vehicle at a plurality of fuel dispensing points;

    measuring amounts of vapor flow recovered at said plurality of fuel dispensing points to be returned back to the underground storage tank in aggregate from active fuel dispensing points in said plurality of fuel dispensing points using at least one vapor flow sensor wherein the number of said at least one vapor flow sensors is less than the number of said plurality of fuel dispensing points that can be active at any one time; and

    determining an estimate of the amount of vapor flow recovered by each of said plurality of fuel dispensing points using said amounts of vapor flow recovered in aggregate from said active fuel dispensing points in said plurality of fuel dispensing points.

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